or cannot empty your bladder, you should not take toviaz. get emergency medical help right away if your face, lips, throat or tongue swells. toviaz can cause blurred vision, dizziness, drowsiness, and dreased sweating. do not drive, operate machinery or do unsafe tasks until you know how toviaz affects you. the most common side effects are dry mouth and constipation. [ susan ] today, i'm visiting my son without visiting every single bathroom. [ female announcer ] today, talk to your doctor about toviaz.